Propeller.



No. 847,222. PATENTED MAR. 12, 1907.

A. L. & B. s. AMES.

' PROPELLER.

nrmou'mn FILED BEPT.21,1905.

45 distinguished from prior devices of this type,

, amount of power is attained, one-wherein the mum speed ing the invention and showing the same aptions or stems 3 suitably joined to the hub,

looking toward the outer end of one of the being of any preferred construction and mate- UNITED STATES ATENT OFFICE.

PROPELLERl Specification Application filed September 21,

To all whom it may concern:

Be it known that we, ALoNzo LAMEs and BYRON S. AMEs, citizens of the United Stateg residing at Newberry, in the county of Lycoming and State of Pennsylvania, have invented new and useful Improvements in Propellers, of which the following is a specification. V

This inventionrelates to propellers, and has for its objects to produce a simple ef-y ficient device of this character by which a greatly-increased driving force from a given blades will in passing through the water draw the latter toward and consolidate it at the center of their circle of rotation, one which in action creates a suction in advance of the propeller, and, owing to the consolidation of the waterby the blades, a high pressure in rear of the latter, and, one whereby churning of the water, even during maxiof the propeller, is. wholly obviated. To these ends the invention comprises the novel features of construction and combination of parts more fully hereinafter described.

In the accompanying drawings, Figure 1 is a perspective view of a propeller embodyplied. Fig. 2 is a front elevation of the propeller. Fig. 3 is a detail perspective view blades. Fig. 4 is a transverse section taken on the line 4-4 of Fig. 2. f Fig. 5 is a transverse section taken diagonally through one of the blades on the line 5 5 of Fig. 2.

' Referring to the drawings, it will be-seen that the propeller, which in-practice rotates from right'to left, as indicated by the arrow in Fig. 1, comprises a hub 1 and a plurality of radiating blades 2, having reduced porthese parts, except as hereinafter explained,

rial. In accordance with this invention and as the blades 2, which as a whole include the stems 3, are curved longitudinally from front to rear, each throughout its entire length, and are further given a slight spiral twist from their inner toward their outer ends, each blade being also pitched at a forward and rearward transverseinclination on a line of Le ters Patent. Patented March 12, 1907.

1906. Serial No. 279,482-

oblique to the longitudinal axis of the hub 1.

I Each blade has its rear edge cutaway or recessed, as at thus forming at a point adj acent the outer end of the blade a reduced rearward extension 5, presenting a restricted point at which the water is discharged in a direct line rearwardly from the blade and at the same time producing a strong suction in advance of the latter, whereby the driving .power of the propeller is measurably increased. I

In practice, owing to the blades being of the peculiar formation described, the water will during the operation of the pro eller be drawn inward toward the center of t e circle of rotation of the blades and concentrated or massed by the latter and thence discharged directly rearward from the propeller at the 1 restricted discharge-point 5, while at the same time a powerful suction will be created in advance of the latter, thus measurably increasing the driving power of the propeller relative to a given expenditure of energy and augmenting its efiectiveness in propelling the vessel; also, owing to the mode of operation of the ropeller and the improved form ofits bla es churning of water by the propeller is whollyobviated and theconstant action of the latter on unbroken water is consequently insured.

From the foregoing it is apparent that we produce a simple device admirably adapted for the attainment of the ends in view, it be' ing understood that minor changes in the details herein set forth may be resorted to Without departing from the spirit of the invention.

Having thus fully described our invention,

oblique to the axial line of the hub.

2. A propeller comprising a plurality of blades curved throughout their length from front-to rear and s irally twisted from end to end, said blades eing pitched at a transvei'se inclination on a line oblique to the In testimony whereof we afiix our signatures in presence of two wltnesses.

ALONZO -L.AMES. BYRON s. 'AMES.

axial line of the impeller and having their rear edges reeesse to form reduced rearward extensions, said extensions being disposed adjacent the outer ends, of the blades and\ presenting restricted points at which the we.- Witnesses; V ter is ischarged rearwardly from the JOHN H. BER-RY, blades.

| WM. H. WU'RSTER. 

